# Relationship history for MSHA mine 3502576

Current hierarchy: **Dorothea D Ellis; Mark  Ellis → Mid-Valley Gravel Company → WICKS PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mid-Valley Gravel Company → WICKS PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barbara  Ellis et al → WICKS PIT; 1950-01-01 to 2022-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Barbara  Ellis et al → Mid-Valley Gravel Company; 1950-01-01 to 2022-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Dorothea D Ellis et al → WICKS PIT; 2022-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dorothea D Ellis et al → Mid-Valley Gravel Company; 2022-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Ellis et al → Mid-Valley Gravel Company; 2022-05-11 to current/open; source msha-controller-operator-history